Platinum Complex Luminescent Material for OLED Durability
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Solution Overview
Problem
Platinum complexes with ether linkages exhibit weak luminescence at room temperature and luminescent materials containing unidentate ligands, such as halogen atoms, have low durability in organic electroluminescent elements.
Innovation Solution
Development of an organic electroluminescent element incorporating a compound represented by formula (I), which includes specific atomic groups and linking structures that enhance luminescent characteristics, durability, and vapor deposition properties, featuring a platinum complex with improved luminance, quantum yield, and driving voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unidentate ligands containing halogen atoms are used, then luminescent material can be formed, but element durability becomes low
Solution Approach 1:
The patent extracts and removes harmful halogen atoms from the ligand structure while retaining the essential coordinating atoms. By eliminating the halogen atoms that cause durability issues, the resulting platinum complex achieves both high element durability and strong luminescence without the harmful side effects.
Solution Approach 2:
The patent replaces stable but harmful halogen-containing ligands with more labile yet beneficial carbonyl and heterocyclic ligands that provide both durability and strong luminescence. This substitution strategy trades the stability of halogen bonds for the functional superiority of carbonyl coordination.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The organic electroluminescent element demonstrates enhanced luminescent characteristics, including increased luminance, quantum yield, and durability, with improved vapor deposition properties, effectively addressing the limitations of previous platinum complexes.
Implementation Method 1
an element containing a phosphorescence-emitting material comprising heavy metals such as iridium and platinum has attained high efficiency
Implementation Method 2
improved vapor deposition properties
Data Source
AI summary
An organic electroluminescent element comprising a pair of electrodes and at least one organic compound layer including a luminescent layer between the pair of electrodes, wherein at least one of the at least one organic compound layer comprises a compound represented by the following formula (I):wherein in formula (I), Q1 represents an atomic group necessary for forming an unsaturated ring together with the carbon atom; Q2 and Q3 each independently represent an atomic group necessary for forming an unsaturated ring together with the nitrogen atom; X represents a partial structure comprising an atom that is linked to the platinum atom; A1 represents a linking group; B1, B2 and B3 each independently represent a linking group or a single bond; m and n each independently represent 0 or 1; and at least one of m and n is not 1.